Introduces a new test suite that creates and deletes many VolumeSnapshots simultaneously to test snapshottable storage plugins under load.
A partial copy of https://github.com/kubernetes-csi/docs/tree/master/book/src/example, with some modifications:
- serviceAccountName is used instead of the deprecated serviceAccount
- the RBAC roles from driver-registrar, external-attacher, external-provisioner and external-snapshotter are used